For 2013-2018 RAM 2500 3500 6.7L Diesel. Cooling Fan Clutch Wiring Harness Connector. Type: Cooling Fan Clutch Harness Wiring Connector. For 2013-2018 RAM 2500/3500 6.7L Diesel. Improved Cooling Performance– Ensures stable operation of the fan clutch to prevent engine overheating.